JPS63286616A - Safety device for warm-air room heater - Google Patents

Abstract

PURPOSE:To prevent the danger, such as breakage, fire or the like, of an appara tus as well as the operation of an overheat preventing device before operating a filter sign device, by providing a plurality of safety means operated by an output signal from a pressure deciding means which decides whether or not a pressure is within a plurality of set pressure ranges. CONSTITUTION:A pressure deciding means 12 compares a pressure P, detected by a pressure detecting means 8, with the pressure range P1-P2 of a narrow pressure range setting means 9, the pressure range P3-P4 of a medium pressure range setting means 10 and the pressure range P5-P6 of a wide pressure range setting means 11 at all times. When P>=P2 or P<=P1, the pressure deciding means 12 outputs a signal to an alrming means 13 to inform the outside of a room of the clogging of a filter 6 however, the operation of the title heater is continued. When P>=P4 or P<=P3, the pressure deciding means 12 outputs a signal to an operation control means 14 and reduces the amount of combustion forcibly. Further, when P>=P6 or P<=P5, the pressure deciding means 12 outputs a signal to the operation control means 14 to stop the operation of the heater.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a safety device for preventing abnormal overheating of a warm air heater and a filter sign for indicating a clogged filter.

Conventional technology Conventional hot air heaters use a temperature detection switch that uses bimetal as an overheating prevention device to detect abnormal overheating and stop the operation of the appliance to maintain safety, and double safety in case the bimetal switch malfunctions. A humidity fuse was installed as a device to ensure safety in the event of abnormal overheating.

In addition to the above-mentioned overheating prevention device, a bimetal switch or thermistor has been used as a filter clogging sign detection device to notify the user of an abnormality such as dust clogging in the air intake port before abnormal overheating occurs.

Problems to be Solved by the Invention Generally, the operating temperature of bimetal switches is set to a high temperature to prevent malfunctions during normal operation, so when the temperature rises moderately, the device is exposed to abnormally high temperatures for a long time until it operates. . In addition, overheating prevention devices based on humidity detection do not operate until a dangerous situation occurs, and the bimetallic detector itself has a large heat capacity, so there is always a delay in operational response. However, it will be exposed to high temperatures.

Furthermore, it is used as a sensor (hereinafter referred to as a filter sign device) to notify when the air intake port is clogged with dust, etc.
A separate device was installed in addition to the overheating prevention device mentioned above. In this way, if the overheating prevention device and the filter signature device are provided separately, various ways of blocking the intake port, reaction speed of the device,
Alternatively, depending on the mounting position, etc., there is a risk that the overheating prevention device will be activated before the filter signature device is activated, causing problems such as the appliance being stopped.

The present invention solves the above-mentioned problems, and quickly responds to stop the appliance before it reaches a state where even mild overheating of the appliance may cause damage to the appliance, thereby preventing appliance damage or fire. It is an object of the present invention to provide a hot-air heater that prevents such dangers as well as a contradiction that is caused by an overheating prevention device before a conventional filter signature device is activated.

Means for Solving the Problems In order to achieve the above object, the hot air heater of the present invention includes a pressure detection means for detecting the pressure inside the main body which changes due to blockage of the intake port, and a fill line of the intake port. It is possible to set a pressure range that does not pose a problem by notifying the user of a blockage, a pressure range that does not pose a problem in actual use if the amount of combustion is reduced even if the intake port is blocked, or a pressure range that does not cause problems in actual use by reducing the combustion amount even if the intake port is clogged. Pressure range setting means for a plurality of ranges for each setting, etc., pressure determination means for determining whether the pressure detected by the pressure detection means deviates from the plurality of set pressure ranges, and actuated by an output signal from the pressure determination means. The structure is equipped with multiple safety measures.

Effect: With the above-described configuration, the present invention detects pressure changes inside the main body due to blockage of the intake port, outlet, etc. with one pressure detection means, and detects pressure changes within a plurality of set pressure ranges and the pressure detection means with the pressure judgment means. By comparing the pressures reached and sending signals to multiple safety measures in response to the pressure reached, and controlling the operation appropriately for the state of the equipment, it is possible to improve the usability of the equipment and prevent damage to the equipment due to overheating. , it is possible to prevent dangers such as fire caused by this.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is an exterior case, 2 is a burner, 3 is a heat exchanger, 4 is a convection fan for hot air circulation, 5 is an intake port for hot air and combustion air, and 6 is installed at the intake port 5. Fill, 7
Reference numeral 8 indicates a hot air outlet, and 8 indicates pressure detection means such as a silicon diffusion type pressure sensor, which is installed in the heat exchanger a here. 9
Reference numeral 10 indicates means for setting a narrow pressure range corresponding to the filter signature device, 10 indicates intermediate pressure range setting means corresponding to a state where the amount of combustion is temporarily reduced, 11 indicates means for setting a wide pressure range corresponding to overheat prevention, 12 are the pressure detected by the pressure detection means 8 and the pressure range setting means 9, 10.
11 is a pressure determining means for making a determination by comparing it with a pressure range set; 13 is a display or alarm means for notifying the outside of the clogging of the fill by the output signal of the pressure determining means 12; and 14 is a pressure determining means by the output signal of the pressure determining means 11. This is an operation control means that controls whether to stop, perform weak combustion, or continue operation.

Here, the display or alarm means 13 and the operation control means 14 correspond to multiple stages of safety means.

In the above configuration, the operation will be explained based on the flowchart showing the operating process in FIG.

When the burner 2 is combusted and the convection fan 4 is operated, warm air and combustion air are drawn from the intake port 5 through the filter 6. Then, the hot air exchanges heat with the heat exchanger 3, mixes with the combustion exhaust gas, passes through the hot air flow path, and is blown out as warm air from the blowing lower. Then, the pressure P detected by the pressure detection means 8 is divided into a pressure range P1 to P2 set by the narrow pressure range setting means 9 and a pressure range P3 to P set by the intermediate pressure range setting means 10.
4. The pressure determining means 12 constantly compares the pressure ranges P5 to P6 set by the wide pressure range setting means 11. Then, when P≧P2 or P≦P1, the pressure determining means 12 issues a signal to the alarm means 13, and the alarm means 13 is activated to inform the outside that there is a blockage for 60 days, but operation continues. Next, when P≧P4 or P≦P3, the pressure determining means 12 sends a signal to the operation control means 14 to forcibly reduce the combustion amount. Furthermore, when P≧P6 or P≦P5, the pressure determining means 12 issues a signal to the operation control means 14 to stop the operation.

In this embodiment, three stages are used as an example, but it is also possible to set more stages.

Effects of the Invention As is clear from the above embodiments, the present invention allows the pressure detected by one pressure detection means to be divided into, for example, a narrow set pressure range to notify of fill clogging, an intermediate set pressure range to reduce the amount of combustion, and an overheating range. Compared to the wide set pressure range that shuts down the operation of the equipment, the system issues a warning or display of the filter clogging and controls the operation of the equipment, so it is possible to know in an orderly manner whether the filter is clogged or how to prevent overheating of the equipment.

Furthermore, since it detects pressure instead of temperature, it is sensitive and can quickly respond to blockages in intake ports, etc., making it extremely useful as a safety device of this type, and since only one pressure detection means is sufficient, its configuration is simple. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart showing the operating process of this embodiment. 8... Pressure detection means, 9... Narrow pressure range setting means, 10... Intermediate pressure range setting means, 11. Pressure determination means, 12... Wide pressure range setting means, 13.
... Alarm means, 14... Operation control means. Name of agent: Patent attorney Toshio Nakao and one other person? −
Node 3- Connection #4-#Kou fan 5-ff1t air port 6- Filter 7-Outlet 8- Kouka Soda valve delivery Figure 1 Figure 2

Claims (2)

[Claims] (1) In a heater equipped with a heat generator, a heat exchanger, and a convection fan, a pressure detection means installed inside the main body,
pressure range setting means for setting any plurality of pressure ranges;
pressure determination means for comparing a plurality of pressure ranges set by the pressure range setting means and the pressure detected by the pressure detection means; and a pressure determination means for comparing each of the plurality of arbitrarily set pressure ranges and the pressure detected by the pressure detection means. and a plurality of safety means that operate in response to an output signal from the pressure determination means that compares the pressure detected by the pressure detection means and determines that the pressure detected by the pressure detection means is outside a plurality of arbitrarily set pressure ranges. A safety device for hot air heaters featuring: (2) A safety device for a hot air heater according to claim 1, wherein a pressure sensor whose resistance changes in proportion to pressure is used as the pressure detection means.